Question

我有一个表单应用程序，其中要显示多个DataGridView对象（但不能一次显示）。它们应该彼此创建，然后可以使用ComboBox切换显示的DataGridView。我有一个函数，该函数应在每次调用时创建新的DataGridView，然后将名称添加到ComboBox：

private void readCSV(string DBname)
{
    DataGridView tagDBname = new DataGridView();
    tagDBname.Location = new System.Drawing.Point(24, 260);
    tagDBname.Name = DBname;
    tagDBname.Size = new System.Drawing.Size(551, 217);
    tagDBname.TabIndex = 6;

    tagDBname.Columns.Add("Column1", "Col1");
    tagDBname.Columns.Add("Column2", "Col2");

    tagDBname.Visible = false;

    comboBoxTag.Items.Add(DBname);
}

然后，我想更改CGridBox中给定名称的DataGridView的可见性状态。当索引更改时，应在调用的函数中完成此操作：

private void comboBoxTag_SelectedIndexChanged(object sender, EventArgs e)
{
    // Get the name of the DataGridView which should be visible:
    string selectedTagDB = comboBoxTagDatabases.SelectedItem.ToString();
    DataGridView tagDatabase = ? // Here the DataGridView should be selected given the name "selectedTagDB"

    tagDatabase.Visible = true;
}

在上面，我不知道如何仅根据给定的名称分配DataGridView。任何帮助将不胜感激-即使这意味着所选择的方法与我要达到的目标不匹配。如果在其他地方回答了问题，请随时向正确的方向引导我：）

Answer 1

我将使用数据库名称作为键将网格视图存储在字典中；

readonly

如果您需要对选定的gridview做一些事情，可以使用以下方法获得它：

private readonly Dictionary<string, DataGridView> _tagDBs =
    new Dictionary<string, DataGridView>();

private void readCSV(string DBname)
{
    DataGridView tagDBname = new DataGridView();

    // Add the gridview to the dictionary.
    _tagDBs.Add(DBname, tagDBname);

    tagDBname.Name = DBname;
    tagDBname.Location = new System.Drawing.Point(24, 260);
    tagDBname.Size = new System.Drawing.Size(551, 217);
    tagDBname.TabIndex = 6;

    tagDBname.Columns.Add("Column1", "Col1");
    tagDBname.Columns.Add("Column2", "Col2");

    tagDBname.Visible = false;

    this.Controls.Add(tagDBname); // Add the gridview to the form ot to a control.
    comboBoxTag.Items.Add(DBname);
}

private void comboBoxTag_SelectedIndexChanged(object sender, EventArgs e)
{
    // Get the name of the DataGridView which should be visible:
    string selectedTagDB = comboBoxTagDatabases.SelectedItem.ToString();

    foreach (DataGridView dgv in _tagDBs.Values) {
        dgv.Visible = dgv.Name == selectedTagDB; // Hide all gridviews except the selected one.
    }
}

注意：您必须将gridview添加到窗体或窗体上的容器控件。例如

if (_tagDBs.TryGetValue(selectedTagDB, out DataGridView tagDatabase)) {
    // do something with tagDatabase.
}

Answer 2

您可以遍历表单的所有DataGridView，以使用其名称显示所需的名称，同时隐藏其他名称。

这种解决方案虽然不完美，但可以解决

private void ShowOneDataGridViewAndHideOthers(string name)
{
    foreach (var DGV in this.Controls.OfType<DataGridView>())
    {
        DGV.Visible = DGV.Name == name;
    }
}

并这样称呼：

private void comboBoxTag_SelectedIndexChanged(object sender, EventArgs e)
{
    // Get the name of the DataGridView which should be visible:
    string selectedTagDB = comboBoxTagDatabases.SelectedItem.ToString();
    ShowOneDataGridViewAndHideOthers(selectedTagDB);
}

可以通过以下方式使方法更通用：

private void ShowOneControlAndHideOthers<T>(string name, Control controls) where T : Control
{
    foreach (var control in controls.Controls.OfType<T>())
    {
        control.Visible = control.Name == name;
    }
}

private void comboBoxTag_SelectedIndexChanged(object sender, EventArgs e)
{
    // Get the name of the DataGridView which should be visible:
    string selectedTagDB = comboBoxTagDatabases.SelectedItem.ToString();
    ShowOneControlAndHideOthers<DataGridView>(selectedTagDB, this);
}

仅给定名称，更改DataGridView的可见状态

2 个答案: